Light guide plate with diffusing protrusions

Abstract

A light guide plate (10) includes a transparent plate (20), and a plurality of diffusing protrusions (30). The transparent plate includes an emitting surface (21), and a bottom surface (23) opposite to the emitting surface. The diffusing protrusions are distributed evenly on the emitting surface of the transparent plate, and are integrated with the transparent plate. The diffusing protrusions are hemispherical or sub-hemispherical, and a diameter of each diffusing protrusion is in the range from 10 μm˜50 μm. The light guide plate provides high emitting brightness and uniformity. The diffusing protrusions can diffuse light beams emitting from the emitting surface of the transparent plate, in order to achieve a plane light source having even brightness. The present Invention also discloses a method for fabricating the light guide plate.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to light guide plates used in liquid crystal displays, and to methods for fabricating light guide plates.[0003]2. Description of the Prior Art[0004]A liquid crystal display is capable of displaying a clear and sharp image through millions of pixels of image elements. It has thus been applied to various electronic equipment in which messages or pictures need to be displayed, such as in mobile phones and notebook computers. However, liquid crystals in the liquid crystal display do not themselves emit light. Rather, the liquid crystals have to be lit up by a light source so as to clearly and sharply display text and images. The light source may be ambient light, or part of a backlight system attached to the liquid crystal display.[0005]A conventional backlight system generally comprises a plurality of components, such as a light source, a reflective plate, a light guide plate, a diffusion plat...

AI Technical Summary

Benefits of technology

The present invention provides a light guide plate with excellent diffusion of light. The plate has a transparent plate with diffusing protrusions evenly distributed on its surface. The protrusions are hemispherical or sub-hemispherical with a diameter ranging from 10 μm to 50 μm. The diffusing protrusions can diffuse light beams emitting from the plate, resulting in a plane light source with even brightness. The bottom surface of the plate has dots that can scatter and reflect incident light beams, eliminating internal reflection and making the light beams evenly emit from the surface. The method for fabricating the light guide plate includes steps of fabricating a mother mold, forming a cavity in the mother mold, forming a plurality of holes under the cavity, and fabricating the light guide plate using the mold with the cavity.

Problems solved by technology

However, the diffusion plate 120 is an extra element that adds to costs of raw materials and costs of manufacturing.

As a result, optical performance of the backlight system 100 is diminished.

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